November 26, 2015

You have a 100 coins laying flat on a table, each with a head side and a
tail side. 10 of them are heads up, 90 are tails up. You can't feel,
see or in any other way find out which side is up. Split the coins into
two piles such that there are the same number of heads in each pile.

November 10, 2015

Bruce is an inmate in a large prison, and like most of the other
prisoners, he smokes cigarettes. During his time in the prison, Bruce
finds that if he has 3 cigarette butts, he can cram them together and
turn them into 1 full cigarette. Whenever he smokes a cigarette, it
turns into a cigarette butt.One day, Bruce is in his cell talking to one of his cellmates, Steve."I
really want to smoke 5 cigarettes today, but all I have are these 10
cigarette butts," Bruce tells Steve. "I'm not sure that will be enough.""Why
don't you borrow some of Tom's cigarette butts?" asks Steve, pointing
over to a small pile of cigarette butts on the bed of their third
cellmate, Tom, who is out for the day on a community service project."I
can't," Bruce says. "Tom always counts exactly how many cigarette butts
are in his pile, and he'd probably kill me if he notices that I had
taken any."However, after thinking for a while, Bruce figures out a
way that he can smoke 5 cigarettes without angering Tom. What is his
plan?